nigig-org/THIRD_PARTY_NOTICES.md

# Third-Party Licenses

## dart-pdf

**Repository:** https://github.com/DavBfr/dart_pdf  
**License:** Apache License 2.0  
**Copyright:** Copyright 2018-2025 DavBfr and the dart-pdf contributors

### Architecture Attribution

The Nigig PDF crate architecture — four-layer crate separation (`pdf-cos` → `pdf-document` → `pdf-graphics` → `pdf-makepad`), the PdfDevice trait pattern, the content-stream interpreter pipeline, and the golden-test methodology at the engine-neutral boundary — was derived from the dart-pdf package architecture (commit `17df3d01`, release 3.1.1).

### Key Architectural Patterns Inherited from dart-pdf

1. **Crate/Package Boundaries** — dart-pdf's four packages (`pdf`, `pdf_document`, `pdf_graphics`, `printing`) directly informed the four-crate Rust structure.
2. **PdfDevice Interface** — The device/callback pattern for content stream interpretation (dart-pdf's `PdfDevice` class) became the `PdfDevice` trait in `pdf-graphics`.
3. **Font Engine Design** — dart-pdf's `Font` class and CID font handling architecture informed the `GlyphWidths`, `CMap`, and `SFNT` parsing modules.
4. **Content Stream Parser** — The single-pass operator parsing approach was adapted from dart-pdf's `ContentStream` parser.
5. **Test Structure** — dart-pdf's three testing layers (unit tests, corpus tests, golden tests) were replicated.

### Modified from Original

The following adaptations were made from dart-pdf's implementation:
- **Language**: Ported from Dart to Rust, using Rust idioms (ownership, traits, pattern matching)
- **Compression**: Uses `miniz_oxide` crate instead of Dart's `zlib`
- **Incremental Updates**: Extended from dart-pdf's `update` package
- **Encryption**: Implemented with `rc4`, `aes`, and `md-5` crates; adapted from dart-pdf's crypto implementations
- **Rendering**: PDF → makepad DrawVector/DrawText instead of Flutter canvas

### dart-pdf License Text

```
                                 Apache License
                           Version 2.0, January 2004
                        http://www.apache.org/licenses/

   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION

   1. Definitions.

      "License" shall mean the terms and conditions for use, reproduction,
      and distribution as defined by Sections 1 through 9 of this document.

      "Licensor" shall mean the copyright owner or entity authorized by
      the copyright owner that is granting the License.

      "Legal Entity" shall mean the union of the acting entity and all
      other entities that control, are controlled by, or are under common
      control with that entity. For the purposes of this definition,
      "control" means (i) the power, direct or indirect, to cause the
      direction or management of such entity, whether by contract or
      otherwise, or (ii) ownership of fifty percent (50%) or more of the
      outstanding shares, or (iii) beneficial ownership of such entity.

      "You" (or "Your") shall mean an individual or Legal Entity
      exercising permissions granted by this License.

      "Source" form shall mean the preferred form for making modifications,
      including but not limited to software source code, documentation
      source, and configuration files.

      "Object" form shall mean any form resulting from modification of
      their Source form or additions and modifications of that Source
      form or Derivative Works thereof, although commercial products may
      be subject to the provisions of Section 10.1(a) of this License.

      "Work" (or "Project") shall mean the work of authorship, whether in
      Source or Object form, made available under the License, as
      indicated by a copyright notice that is included in or attached to
      the work (an example is provided in the Appendix below).

      "Derivative Works" or "Modifications" shall mean any work of
      authorship, whether in Source or Object form, that is based
      upon the Work (including, but not limited to, modifications to
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      copyright owner for inclusion in the Work by the copyright owner.

   2. Grant of Copyright License. Subject to the terms and conditions of
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   4. Redistribution. You may reproduce and distribute copies of the
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      (a) You must give any other recipients of the Work or Derivative
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      (b) You must cause any modified files to carry prominent notices
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      (c) You must retain, in the Source form of any Derivative Works
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      (d) If the Work includes a "NOTICE" text file as part of its
          authorship; or within a display generated by the Work, if and
          wherever third-party notices normally appear. Unless
          intentionally given to You by the Licensor, you may not
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   5. Submission of Contributions. Unless You explicitly state otherwise,
      any Contribution intentionally submitted for inclusion in the Work
      by You to the Licensor shall be under the terms and conditions of
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      Notwithstanding the above, the terms of this License do not
      exempt You from the legal obligation to secure any other
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   6. Trademarks. This License does not grant permission to use the
      trade names, trademarks, service marks, or product names of the
      Licensor, except as required for reasonable and customary use in
      describing the origin of the Work and reproducing the content of
      the Work.

   7. Disclaimer of Warranty. Unless required by applicable law or
      agreed to in writing, Licensor provides the Work (and each
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   8. Limitation of Liability. In no event and under no legal theory,
      whether in tort (including negligence), contract, or otherwise,
      unless required by applicable law (such as deliberate and grossly
      negligent acts for calculated damages), or in any manner
      reasonably related to any single Event of loss, damage, or injury
      arising out of the Work, shall any Contributor be liable to You
      for damages, including any direct, indirect, special, incidental,
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      this License or out of the use or inability to use the Work
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      commercial damages or losses), even if such Contributor has been
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   9. Accepting Warranty or Additional Liability. While redistributing
      the Work or Derivative Works thereof, You may choose to offer,
      and charge a fee for, acceptance of support, warranty,
      indemnity, or other liability obligations and/or rights
      consistent with this License. However, in accepting such
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      Your sole responsibility, not on behalf of any other
      Contributor, and only if You agree to indemnify, defend,
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      by, or claims asserted against, such Contributor by reason of
      your acceptance of such warranty or additional liability.

   END OF TERMS AND CONDITIONS

   APPENDIX: How to apply the Apache License to your work.

      For easy redistribution by licensees of an
      Apache-licensed product, the accompanying
      NOTICE file may be replaced with this notice:

         Copyright 2018-2025 DavBfr

      Licensed under the Apache License, Version 2.0 (the "License");
      you may not use this file except in compliance with the License.
      You may obtain a copy of the License at

          http://www.apache.org/licenses/LICENSE-2.0

      Unless required by applicable law or agreed to in writing,
      software distributed under the License is distributed on an
      "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
      KIND, either express or implied. See the License for the
      specific language governing permissions and limitations
      under the License.
```

## makepad

**Repository:** https://github.com/andodeki/makepad  
**License:** MIT OR Apache-2.0 (dual-licensed)  
**Copyright:** Copyright 2024 Makepad authors

The `pdf-makepad` crate depends on the Makepad framework (`makepad-widgets`) for rendering PDF content to GPU draw lists. Makepad is dual-licensed under MIT and Apache-2.0.

```
MIT License

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
```

## miniz_oxide

**Repository:** https://github.com/bytecode-crypt/miniz_oxide  
**License:** MIT OR Zlib  
**Copyright:** Copyright (c) 2018 The Chromium Authors and miniz_oxide contributors

Used by `nigig-pdf-cos` for FlateDecode decompression and zlib compression of PDF objects.

```
MIT License

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
```

## Crypto Dependencies (encryption)

The following crates are used by `nigig-pdf-cos` for PDF encryption:

- **rc4** (`rc4` crate) — MIT OR BSD-3-Clause
- **aes** (`aes` crate) — MIT OR Apache-2.0
- **md-5** (`md-5` crate) — MIT OR Apache-2.0
- **sha2** (`sha2` crate) — MIT OR Apache-2.0
- **block-modes** (`block-modes` crate) — MIT OR Apache-2.0
- **cbc** (`cbc` crate) — MIT OR Apache-2.0
- **cipher** (`cipher` crate) — MIT OR Apache-2.0
- **crypto-common** (`crypto-common` crate) — MIT OR Apache-2.0
- **block-padding** (`block-padding` crate) — MIT OR Apache-2.0
- **block-buffer** (`block-buffer` crate) — MIT OR Apache-2.0
- **inout** (`inout` crate) — MIT OR Apache-2.0
- **digest** (`digest` crate) — MIT OR Apache-2.0